Automatic heald stop motion for dobby looms



oet. 1s, 1949. P. RUESCH 2,485,414

AUTOMATIC HEALD STOP-MOTION FOR DOBBY LOOMS Filed Feb. 4, 1948 3Sheets-Sheet l Qrvucmtofo Paul L/esc/z oct. 1s, 1949. P. RUESCH2,485,414

AUTOMATIC HEALD STOP-MOTION FOR DOBBY LOOMS Filed Feb. 4, 1948 3Sheets-Sheet 2 Syvum/fm am! Huesca Oct. 18, 1949. P. RUEscH y 2,485,414

AUTOMATIC HEALD STOP-MOTION FOR DOBBY LOOMS Filed Feb. 4, 1948 I 3sheets-sheet 5 Paw Z Hueso/z Patented Oct. 1&8, 1` 949 AUTOMATIC HEALDST-Ql MD'lION FOR DOBBY LOQMS Paul Resch, Tnrbenthail, SwitzerlandApplication February 4, 1948.,.Se11ial No. 624.6 In Switzerland November2.8 1947 A9 .Claims Mechanical or electrical warp stop motions l`with orWithout droppen-s, brought vforward iaith,- erto Within a rather longperiod of time, .could as a rule not stand the test `of practice on.account of their *limited possibilities of application and intricatedesign. The adoption .or 'known Warp stop motions been possible Ionly.tor .duits :limited kind of weaving. Thus, for instance. in Wool, juteand linen .weaving .no material progress has been mad-e in the .design.of .the usual warp stop motions.

Now the yobject .or the .present tn-.vention .is a mechanical .orautomatic hee-1d .stop Imation for -dobby looms which .is distinguishedfrom known ,warp stop motions that .on each neald frame two racks withupper teeth .are placed in vparallel Which pass with play through allthe heald @Ye-S., one rack being mounted firmly in the frame. whilst therotherfemovable in longitudinal direction with ,respect .to .the,stationary yone-is at one ond -n driving connection with a leverpivotally supported on the heald frame, a stopdevice rigidly mounted .onthe loom trame ,projecting into the motion path of `said lever. whereby.at the vside ,of .the heald vframes opposite the .abutment a cantileverloormnon to ,all heald ,frames is oscllatalzly .arranged on .an axis.rieifllyseouled to the loom framing, which cantilever projects into thevertical motion path ofthe movable rack retained in one extreme 'limitposition and is operatively connected to the stop motion of the loom.

The accompanying drawing illustrates by way of example a preferred formof embodiment 'incorporating the invention.

8, through the eyes 9 of which the warps I-0 are passed in the usual Wayto -form the shed.

4The rack 5 4and bar I lare supported in bearings II (Figs. l and 2) onthe Vertical parts of -the rra-me, -each of them being secured in place:by-a resiiientpin -I2 which engages covering holes of the bearing andthe bar. The rack vli vhas tus-h i3 and is of channeled cross-sectionand receives in its hollow space the ila-t rack B as more particularlyshown in Fig. 3, the rack 6 having prismatic l :teeth til substantiallyof identical height and length. Further', the r-ack 'B is disposed forend- Wise movement in rack -5. Now, another arr-angeme-nt is such thatwith moving heald frame the rack iIi is displaced in one directionandthen reset by spring action. To ensure ythis movement in -aeontin-ous way, the rack 5 is provided with `spaced holes f throughwhich the dust which may accumulate thereon -is eliminated.

lin the ferm of vembodiment shown, the displacement of the rack 6 'withlowering lheald frame takes place by a stop. For this purpose the rack 6is at one 'end brought into operative :eng-agement with crank lever t5pivot-ally mount- -ed Aat lr6 on the 'heald -f-rame, embracing by itsxlork -a pin I'I of the rack 6, which pin enters an elongated s'lot I8of rack 5. A spring member -I-S restores the moved rack B Ito normal.The bellorarrk lever-s I5 on the hea-ld Afra-mes co- ,30 -operate -withstops situated on the loom Wall.

.Fig. l shows an elevation of the left-hand 'half of a 'heald frame;

Fig. Jla. represents an elevation ,of the righthand half of the healdframe with the stop motion of the loom;

Fig. 2 is a vertical section taken on the line .2-2 of Fig. 1a;

Fig. '3 'is a sectional View taken on the 'line 3-'3 of Fig. 1;

Figs. 4, '5 and 6 show various details.

Referring to said annexed drawing, the heald frame I preferablycomprises 'horizontalwooden and vertical metallic parts, stirrups r2being arranged on the former, from which start the Olds or 'belts usedfor raising and lowering the `heald frames (harness) vertically `guidedbetween vfla'tfhs '3, '4 of the loom. Disposed on l'top within -theframe area of the heald yframes aretwo 'horizontal racks 5, 6 and at thebottom ordinary bar 1 'adapted `to Varrange 'and or to suspend the'healds Figs. Ail and 5 exhibit, with a small number ofheald frames, acommonly employed stop plate 20 which extends in the direction of thewarp, having 4a sloped contact edge 2| conforming in shape 'with theshed. Said plate is secured 'by anangle piece 23 -to-the guide bar 3firmly seated on the loom 'boa-rd 22, being adjustable vto anydirection, especially 4vertically and horizontally, Lby-means o f theslots 24 and 25.

With an increased number of 'heald frames, the stopplate will lbereplaced by spaced stops '26 Vwhich in number correspond to that of theheald frames, each or them being (individually) adjustable fin heightvon the horizontally displace- Iable angle piece `23, through slot 21,.Thus, with single manipulation, this arrangement allows of easilyobtaining an absolutely uniform shedding.

'llhe action of the -aforedescribed device -is ,as tollows:

1H, withithe loom vin operation, the heald frames Yform the shed, then,4with lowering sha-its, the arm I5 of the related lbell crank lever I5strikes against Lthe pla-te 1itl) or one of the stops 26, thus causingthe rack -S disposed -in Athe stationary rack 5 to move -to the right-in the direct-ion of the arrow 28, i. e. by more than one tooth pitch,whilstl with rising of the heald frames it is restored to normal by theaction of Spring I9. In the shedding the healds I8 are held in theraised position I (Figs. 1 and 3) by the tensioned Warp threads of thelower shed so that the movement of the rack 6 remains without influenceon the healds. However, the healds pertinent to the broken warp threadsare not kept raised, but fall by their own weight until their eyes 29lie on the racks 5, 6 so that these healds are raised by the teeth ofrack 6 moving to the right, where they nally drop into a space betweenthe teeth of the stationary rack 5 (see position II in Fig. l). At thestart of the return of rack 6, one or more heald eyes 29 become clampedbetween two teeth of the racks 5, 6 as in Fig. 6. To ensure this actionthe eye 29 is provided with a horizontal straight end portion 29. Whenusing a hooked heald the plate forming the eye will be of similardesign.

Due to this engagement the rack 6 cannot return to normal, but projectsat 3U at the right end, somewhat beyond the heald frame. This incidentis utilized for stopping the loom. An example of an arrangement adaptedtherefor is as follows:

Supported by a straight heald frame guiding bar 4 (attached to the loom)is an upstanding arm 3| which at its head pivotally carries a lever arm33 on axis 32 and in addition a rigidly mounted arm 34, a resilientcarrier pin 35 being provided therebetween to interconnect the said twoarms. At one end the loose arm 33 carries a bar-like cantilever 36 whichextends Closely at the side of the heald frames arranged in tandem sothat the projecting end 39 of the rack 6 of all heald frames acts uponthe common cantilever 36. Further, iixed on pivot axis 32 is a lever arm3l connected through a Bowden wire 38 to the actual stop motion.

According to the illustrated form of embodiment, the stop motionincludes the well-known link-motion starting lever 39 pivotallysupporting a double lever 4l) weighted at 4I. The Weight 4l is normallyretained by a pawl 42 in its raised position, in which the lever 40 isso positioned as to render ineiective a projection 43 on the slay withrespect thereto. The Bowden wire 38 leads to the said pawl 42. If uponlift of one or more heald frames the cantilever 36 is carried by theaforementioned rack ends 30, the lever arm '31 is caused to oscillateupwardly in the direction of the arrow, thus tensioning the Bowden wire38 to release the pawl 42. The falling weight causes a pivotal movementof lever 40 which incidentally enters the range of the projection 43which upon action of the slay strikes against lever 49 to disengage thestarting lever 39 in known manner from a 'link notch, which then isbrought to the off position by spring action. Thus the loom isautomatically stopped. A compression spring 44 restores pawl 42 andlever arm 31 to normal, an adjustable stop which, for instance, includesa bolt 5I and a contact plate 52, keeping the Bowden wire taut.

Incidental to the stoppage of the loom an indicator or signallingattachment is operated calling the weavers attention to the action ofthis warp stop motion. The arrangement as an exemplified form ofembodiment according to Figs. 1 and 2 is such that a driver or carrier45 provided on lever arm 31 causes movement of a lever arm 46 having aconspicuously coloured pointer 41 hinged thereto. When acted upon, thepointer projects from a casing into an easily seen position in which itis retained by a shoulder 48.

It is further advantageous to substantially or exactly balance the leverarm 33, 34 and the cantilever 36 as by means of a weight 49 in order tosmooth in so-to-say feeler-fashion, the knock of the rack end 30 on thecantilever 36.

With stopped loom, even with a large number of heald frames the weavercan easily locate any failure of the warp thread. The indicator orsignalling attachment 46, 41 indicates above all that the stoppage ofthe loom is due to the action of the warp stop-motion and not of theweft one. Moreover, the end 30 of the rack 6 projecting laterally of theheald frames (one or more) makes it clear at which heald frame a warphas failed, h

and by the movement of the related rack through the lever arm l5 thelocation of the thread breakage can be made visible, because the loweredheald hangs there in the teeth of the two racks.

To ensure reliable V,operation it is necessary to determine the healdsaccording to the count of yarn.

The advantages of the aforedescribed warp stop-motion over the existingtypes are:

l. Optimum simplicity and possibility of adaption; device usable for allkinds of fabrics.

2. Droppers are dispensed with, which means fewer thread breakages.Suppression of cost for positioning vand drawing-in droppers,consequently also easy passage of the warps.

3. No loss of time in connection with locating thread breakage, as thefailure is shown in the related heald frame. Poorly sized materialcannot impair the stop-motion, since the warp threads are not directlyconnected to the actual mechanism.

4. Simple supervision for the weaver, since the arrangement includes buta few suitably assembled parts. It can be mounted on all types of loomsby the weaving master himself, after brief instructions.

The trend of opinions gathered by practical experience is that due toits special economic properties the arrangement under review will becomeintroduced within a few years in the whole textile industry for allkinds of fabrics, particularly plain ware.

What I claim is:

1. In an automatic heald stop-motion for dobby looms, vertically movableheald frames, two racks with upper teeth arranged in parallel in eachframe and passing with play through all the heald eyes, one rack beingstationary in the related frame and the other rack being -mounted forendwise movement relative to the stationary rack, a lever pivoted oneach frame and connected with the related movable rack, a stop deviceengageable by each lever moving with the frame to actuate said lever andthe movable rack, a cantilever common to the several frames andprojecting into the path of the movable rack moving vertically with theframe and retained in the position assumed when actuated by said lever,said cantilever being connected to the stop motion of the loom.

2. An automatic heald stop-motion for dobby looms as claimed in claim 1,wherein the rack stationary in the heald frame is of channeledcross-section, its hollow space receiving the movable rack, saidstationary rack being provided with perforations through which theaccumulated dust can escape.

3. An automatic heald stop-motion for dobby looms as per claim 1,wherein the stop device includes a plate adjustable to any direction.

4. An automatic heald stop-motion as claimed in claim 1, wherein forlooms with an especially large number of heald frames, the stop deviceincludes for each frame a special individuallyl adjustable stop.

5. An automatic heald stop-motion as claimed in claim 1, wherein thestop motion includes a pawl operatively connected through a Bowden wireto a lever which carries the cantilever, said pawl reaching in its onereleased position the path of the slay, on the action of which thestarting lever is returned to its off position.

6. An automatic heald stop-motion as claimed in claim 1, having amovable member of the stop motion in operative connection with asignalling attachment, a lever arm which loosely pivots on an axis beingconnectable to an arm rigidly mounted on the latter.

'7. An automatic heald stop-motion as claimed in claim 1, wherein eachof the healds or hook REFERENCES CITED The following references are ofrecord in the le of this patent:

UNITED STATES PATENTS Number Name Date 646,729 Dustin Apr. 3, 1900651,813 Dustin June 12, 1900 1,892,333 Egli Dec. 27, 1932 Wagner Nov. 9,1937

